Automatic electric cut-out



(No Model.)

B. R. KNOWLES. AUTOMATIC ELECTRIC GUT-OUT.

No. 396,940 Patented Jan. 29, 1889.

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UNITED STATES PATENT Orrrcn.

ED\VARD R. KXOVLES, OF BROOKLYN, NEW YORK AUTOMATIC ELECTRIC CUT-OUT.

SPECIFICATION forming part of Letters Patent No. 396,90, dated January29, 1889.

Application filed $eptemher 25, 1838. gerial No. 286,328. (No model.)

To a'ZZ whom it may concern:

Be it known that 1, EDwARD R. KNOWLES, a citizen of the United States,residing in Brooklyn, in the county of Kings and State of New York, havemade certain new and useful Improvements in Automatic Electric Cut-Outs,of which the following is a specification.

The invention relates to automatic electric particular class in whichthe main circuit is 1 adapted to close a local circuit including acut-out magnet.

The invention consists of a current-indicating apparatus of the kinddescribed in my application filed September 25, 1888, Serial No.286,329, in combination with a pair of contacts connected therewith, apair of adjustable contacting devices, and a local circuit controlledthereby, and including a cutout magnet, whereby the burning out of thearmature ot' the dynamo or reversals of the dynamo or discharges of thebattery through the circuit are prevented when for any cause the circuitmay be short-circuited grounded,

or the dynamo stopped or slowed down.

represents a general view of the apparatus and circuits.

The indicating device consists of a solenoid, A, having a semicircularcore, 13, attached to a dipping arm or bar, C. The bar F carries aweight at one end to maintain the bar norcurrent flowing. I haveextended the bar C at each end, in order to attach contactingpoints (2c, which are usually pointed downward or at an angle. contacts willappear later on.

E represents racks or brackets of curved shape. These brackets carryways or guides 1 corresponding mercury contact.

In the accompanying drawing the figure posing the cup 6 to be adjustedso that its the under side by a slidin lid, g, which may be adjusted ina longitudinal direction to insure the hook catching upon the lip, andthus holding the lever G. The lever pivoted at 9 and is pulled downwardwhen released by a spring, hen locked to the armature, the lever makescontact with the spring 71.

The circuits are arranged as follows: The

f main circuit or the circuit to be controlled, cut-outs fordynamo-electric machines of that which includes a dynamo, M, leads fromthe generator through translating devices to the solenoid A of theindicator, thence to the lever G,to contact to line, and back togenerator. A local circuit generated by battery X flows through magnetF, then branches and terminates in each of the mercury-cups c c. Fromthe other side 0t battery the circuit leads to bar C of the indicatorand terminates at each of the points c.

The operation of the device is as follows: The mercury-cups c and c areadjusted upon the guide and set so that the dipping of the bar C ineither direction beyond a certain limit will establish contact betweenone or the other of the extremities of the bar and its Xowsupcorresponding contact-point will connect with it when theindicator-points to 25 and the cup 6 to be set so that contact will bemade with 5 it when the indicator points to 5, when the main currentrises for any cause to the limit break the main circuit at The purposeof these the localcircuit will be closed and magnet F, mally horizontaland a pomter which playsin drawing up its armature, will release theletront of a scale, D, to indicate the amount of ver G, when it willinuuediz'itely drop and The same effect will be produced when thecurrent in the main circuit drops to the limit. By this means thecurrent can never rise to such an extent as to injure the dynamo, andcan never fall below for a pair of mercury-cups, c c, which are;

constructed to be adjustable at any position upon the guide.

F represents an ordinary electro-magnet' acting upon its armature f inopposition to The lower end of the armature is l springf'. formed into ahook, and is adapted to pass through a slot in the lever G. slightlyelongated and is partially covered on The slot is a fixed amount withoutopening the main circuit, and as the current never falls to Zero thebatteries cannot discharge through the I dynamo, and the dynamo cannever have its polarity changed.

Having described my invention, I claim 1. A main circuit including thecoils of a current-indicator, the movable element of saidcurrent-indicator provided with a pair of con tacts, both of whichconnect with the same i side of a local generator. a pair of adjustablecontacts adapted to connect with said pair of contacts upon the saidmoving element, said adjustable contacts being connected with theopposite side of said local generator.

2. The combii'lation, with a main circuit and a local circuit, the maincircuitincluding the coils of a current-indicator, and the local circuitincluding a magnet adapted to open the main circuit, the movable elementof the current-indicator carrying two contactpoints, forming oneterminal of the local circuit, and two adjustable corresponding contactsforming the other terminal of said local circuit.

In an automatic cut-out, a pivoted arm carrying a contact on each sideof its pivot, a curved support carrying corresponding adjustablecontacts, an electro-magnetic device causing movement of the pivotedarm, a main

